Mention the act in share certificates (it's urgent)

We have a Private Company incorporated in 1954 and Previously we issued share certificates by mentioning that "Incorporated under the Companies Act, 1956". and we made allotment in this year and we are issuing Share Certificates for them.

My doubt is whether we have to mention in share certificate that "Incorporated under the Companies Act, 1956" OR "Incorporated under the Companies Act, 2013"